Horizontal forging and upsetting machine



Oct. 25, 1966 J. szAKAcsl 3,230,616

HORIZONTAL FORGING AND UPSETTING MACHINE Filed July 19, 1963 5 Sheets-Sheet l I INVENTOF 021,77 05 J3 cL/(d c5 1;

Oct. 25, 1966 J. szAKAcsl 3,280,616

HORIZONTAL FORGING AND UPSETTING MACHINE Filed July 19, 1963 5 Sheets-Sheet 2 Fig. 2

INVENTOR anos $5cdcaLcS b Oct. 25, 1966 J. szAKAcsl 3,280,616

HORIZONTAL FORGING AND UPSETTING MACHINE Filed July 19, 1963 5 Sheets-Sheet Z Fig.5

INII/ENTOR Jal; 0s Sad/{61x81 fmiy? United States Patent 3,280,616 HQRIZONTAL FORGING AND UPSETTING MACHINE Janos Szakacsi, Leverkuseu, Germany, assignor to Eumuco Aktiengesellschaft fur Maschinenbau, Leverkusen, Germany Filed July 19, 1963, Ser. No. 296,316 Claims priority, application Germany, July 23, 1962, E 23,245 Claims. (Cl. 72417) This invention relates to a horizontal forging and upsetting machine having a tongs-like clamping arrangement, wherein the transmission of the clamping pressure to the clamping bow is effected by two outer pull rods acting on the clamping bow.

The prior art horizontal forging and upsetting machine with tongs-like clamping is so designed that the drive of the pivotally mounted clamping bow is derived from the pressure rod of the upsetting slide. The drive acts on the clamping bow via a multiplicity of transmission members and the outer pull rods on both sides. In this connection, there is articulated to the pressure rod of the upsetting slide a tie connected via a further transmission member with an inner pull rod which indirectly causes the pivoting of the clamping bow.

This transmission arrangement provides the clamping drive with a continuous crank-shaft on which the pressure rod of the upsetting slide is mounted, and a detent zone wherein the clamping system is closed and in which position remains, within a zone in which the upsetting slide travels forwardly and rearwardly for the deformation of the workpieces. The detent zone is, in the prior art machines, provided by the transmission member following the tie, i.e. an angle lever. In this connection, the arc height in the detent zone of the angle lever is relatively small. The result is a clamping force which in the detent zone, oscillates repeatedly between a maximum and minimum value. Furthermore, in the previous horizontal forging and upsetting machine, due to the fact that the transmission arrangement engages the lower end of the pull rods, the machine bed is substantially lower than the operators working position.

It is an object of this invention to provide a new and improved forging and upsetting machine.

It is another object of this invention to provide a de- .velopment and improvement in the horizontal forging and upsetting machine with tongs-like clamping of this kind. It is characterized in that the tie, which is articulated to the pressure rod of the upsetting slide, cooperates with the adjacent transmission part in the form of a double-armed, substantially elongated lever, and the detent zone for the closed clamping arrangement of the clamping how is provided by the movement of said tie. Furthermore, the point of articulation of the tie to the pressure rod of the upsetting slide is such that the said articulation point, the crank pin, and the point of articulation of the pressure rod to the upsetting slide are disposed in a path deviating only slightly from the rectilinear path.

In this manner, the detent zone is disposed in the second member, i.e. the second coupling member in the chain of transmission members. At the same time, a considerably smaller oscillation of the clamping force during the detent zone is achieved. The clamping force varies between a maximum and a minimum value only once during the detent zone, i.e., at the commencement thereof. During the further part of the detent zone, the clamping force remains practically constant. This is achieved without any increase in the number of transmission members over known forging and upsetting machines having tongs-like clamping. The clamping force,

which remains constant for a considerable period of time, allows the transmission members to remain at rest during the exertion of the clamping force. Consequently, there is less friction in the linkage systems and Wear is diminished. A further advantage is achieved by the arrangement of practically equal lever arms in the individual transmission members. This assists the smooth running of the machine.

A further object of this invention is to provide a machine in which the inner pull rod acts via an eccentric on the outer pull rods, the eccentric being mounted in the clamping bow. Due to the rotation of the eccentric, the clamping bow is moved upwardly and downwardly. The outer pull rods can thereby be mounted at one end directly in the machine bed. The outer pull rods then become considerably shorter as compared with the prior arrangement. Due to the compactness of design, a smaller degree of stretching is achieved, with forces and cross-sections remaining equal. The specific stressing is more advantageous.

Advantageously, the transmission members are arranged in the upper part of the machine. Due to this arrangement, the forging and upsetting machine has no moving parts in its lower portion. A smooth bed, which may be located practically at the height of the operation position, is obtained.

The invention is discussed hereinbelow with reference to the drawings, wherein:

FIG. 1 shows, diagrammatically, the arrangement of the transmission members according to the invention;

FIG. 2 is a longitudinal section through an embodiment of the forging and upsetting machine according to the invention;

FIG. 3 is a cross-section taken along the line 3-3 of FIG. 2;

FIG. 4 is a cross-section along the line 4-4 of FIG. 2;

FIG. 5 shows a lateral view of the forging and upsetting machine according to the invention in accordance with what is shown in FIG. 2; and

FIG. 6 shows the forging and upsetting machine :according to the invention, in a view from the other side.

The horizontal forging and upsetting machine according to the invention has, as transmission members, a crank shaft 10 from the crank pin 11 of which the pressure rod 12 is driven; the pressure rod 12 reciprocating the upsetting slide 13 in the guide 14. Articulated to the pressure rod 12 is a tie 15 pivotally connected with the double-arm lever 16 which is mounted to pivot about the bearing point 17. An inner pull rod 18 engages the lever 16.. The clamping bow 19 is pivotally mounted at 20 and is moved upwardly and downwardly by the outer pull rod 21, pivotally mounted in the machine frame at 22. The inner pull rod 18 presses, via a toggle lever 23 on the outer pull rod 21, the clamping how 19 engaging pivotally on the toggle lever 23.

The tie 15, as the second coupling member in the transmission arrangement, engages with the third transmission member 16 in the form of an elongated doublearm lever. At the same time, the die 15 is so articulated to the pressure rod 12 that the point of attack 24 on the upsetting slide 13, the crank pin 11 and the articulation point 25 of the tie 15 are located in a substantially straight path, i.e. deviated only slightly from a straight line. With this arrangement of the transmission members 12, 15 and 16 relative to each other, there is provided (with the continuous crank shaft 10) a detent zone from the position 26 as far as the position 27, in which zone the upsetting slide 13 travels forwardly and rearwardly for deformation of the workpieces and the clamping how 19 is held closed, and wherein the curved portion 28, along which the pivot point 25 moves, is, practically speaking, equivalent to an arc of a circle. Approximately from the point 29m 30, the pivot point 25 travels on an actual arc of a circle. This means that the articulation point 31 of the lever 16 on which the tie 15 is engaged remain, practically speaking, at rest during the movement of the pressure rod 12 from the position 26 to the position 27. Correspondingly, the other transmission members 18, 23, 21 and the clamping member 19 also remain in the at rest position, so that a constant clamping force is exerted. In consequence of the fact that the detent zone is provided as early as on the second coupling member 15 of the chain of transmission members, the at-rest position exerts a considerable influence on all the following transmission members in the sense of a reduction in the wear of the linkage system.

As can be seen in connection with the embodiment illustrated in FIGS. 2 to 6, the upsetting slide 13 has, in a known manner, a rear arm 13a so that the upsetting slide has a long guideway with a continuous profile. The tie 15 can be made extremely short. The double-arm lever 16 has arms of almost identical length and this produces a smooth movement of the transmission members. The inner pull rod 18, which is also subjected to compression stressing, is designed as a'safety pull rod. For this purpose, there is a double toggle lever system 32 and 33 retained in the pressure position by the spring 34. In the case of overload, the double toggle lever system Will be able to deflect by buckling.

In the practical embodiment illustrated, the inner pull or pressure rod 18 acts via a lever 23 on a shaft 36, the

lever 23 and the shaft 36 being keyed to rotate together. The shaft 36 has an eccentric disk 37 which is journaled in one end of the outer pull rod 21. The shaft 36'is mounted in the clamping bow 19. Due to longitudinal displacement of the pull and pressure rod 18, the shaft 36 is rotated with the eccentric 37, whereby the clamping bow 19 is moved upwardly and downwardly. In the illus trated position of the parts, the clamping bow 19 is, for effecting the clamping of the workpieces, in the'closed position and the upsetting slide 13 has reached the foremost position.

' The drive of the forging and upsetting machine is effected by the motor 38 from the belt pulley 39 from which a belt 40 leads to the belt pulley 41 on the shaft 42 upon which a flywheel 43 is mounted. On the shaft 42 is a pinion'gear 44 meshing with a large gearwheel' 45. The said gearwheel45 rotates about the pin 46 of the crank shaft 10. Mounted on the crank shaft is, on one side of the machine, the single-pulley friction coupling 47 and, on the other side of the machine, the single-pulley friction brake 48.

The outer pull rods 21 are,-with the lower bearing shaft 22, mounted directly in the machine bed 49. The same applies to the crank shaft 10 and the bearing shafts 17 and 20.

While there is herein shown and described the preferred embodiment of the invention, it is nevertheless to be understood that minor changes may be made therein without departing'from the spirit and scope of the invention as claimed.

What is claimed:

1. In a horizontal forging and upsetting machine the combination comprising a pivotally mounted clamping how; an upsetting slide, having a pressure rodconnected thereto; an inner pull rod; an outer pull rod, said outer pull rod being connected to one side of said clamping bow; a tie member directly connected to said pressure rod; a transmission member coupling said tiemember to said inner pull rod to cause movement of the clamping bow, said transmission member being formed as a centrally pivoted lever; means for pivotally connecting one end of said lever to one end of said tie member; means for connecting the other end of said lever to said inner pull rod, means for applying oscillatory motion'to said tie member to drive said lever and said pull rods, the transmission of motion from said tie to said inner pull rod.

being oscillatory to provide the clamping bow with oscillatory motion having a rest period in both extreme positions; a crank including a crank pin connected thereto and to said pressure rod to drive said pressure rod; and means for pivotally mounting said pressure rod on said slide, the pressure rod, crank and tie rod being so arranged that the pivot point of the pressure rod on the slide, the crank pin and the pivot connection of the tie rod to the pressure rod are always in a substantially straight line.

2. The machine defined in claim 1 wherein said pressure rod comprises a pivoted lever with the crank pin serving as a fulcrum, and wherein said centrally pivoted lever and the arms thereof lie in a straight line.

3. The machine defined in claim 2, further comprising an eccentric rotatably mounted at the end of said inner pull rod, and means for journalling said eccentric in the end of saidv outer pull rod, said eccentric being mounted on said clamping bow so that the transmission of motion from said inner pull rod is applied to the outer pull rod and to the clamping bow.

4. The machine definedin claim 3 wherein said inner and outer pull rods, said centrally pivoted lever, said tie rod, and the eccentric are all mounted in the upper portion of the machine above the bed thereof.

- to open and to close and to apply forging pressure on the work when closed; said driving means comprising a driven crank having a crank pin; a pressure rod having one end connected to a slide; a tie rod having one end articulated to the other end of said pressure rod, the crank pin being connected to said pressure rod intermediate the ends thereof so that the two ends ofsaid pressure rod and the crank pin are always in a substantially straight line; a centrally pivoted lever having one end connected to the other end of said tie rod; an inner pull rod having one end connected to the other end of said centrally pivoted lever; an outer pull rod pivotally connected at one end to said clamping bow and at the other end to the frame of the machine, and an eccentric connecting the other end of said inner pull rod and said outer pull rod so that motion transmitted from said crank drives the clamping bow open and closed with a rest period at each extreme position.

References Cited by the Examiner UNITED STATES PATENTS 2,682,186 6/1954 Riemenschneider 78-17 3,100,409 8/1963 Esser 78-17 FOREIGN PATENTS 948,381 8/1959 Germany.

CHARLES W. LANHAM, Primary Examiner.v

G. P, CROSBY, Examiner, 

1. IN A HORIZONTAL FORGING AND UPSETTING MACHINE THE COMBINATION COMPRISING A PIVOTALLY MOUNTED CLAMPING BOW; AN UPSETTING SLIDE, HAVING A PRESSURE ROD CONNECTED THERETO; AN INNER PULL ROD; AN OUTER PULL ROD, SAID OUTER PULL ROD BEING CONNECTED TO ONE SIDE OF SAID CLAMPING BOW; A TIE MEMBER DIRECTLY CONNECTED TO SAID PRESSURE ROD; A TRANSMISSION MEMBER COUPLING SAID TIE MEMBER TO SAID INNER PULL ROD TO CAUSE MOVEMENT OF THE CLAMPING BOW, SAID TRASMISSION MEMBER BEING FORMED AS A CENTRALLY PIVOTED LEVER; MEANS FOR PIVOTALLY CONNECTING ONE END OF SAID LEVER TO ONE END OF SAID TIE MEMBER; MEANS FOR CONNECTING THE OTHER END OF SAID LEVER TO SAID INNER PULL ROD, MEANS FOR APPLYING OSCILLATORY MOTION TO SAID TIE MEMBER TO DRIVE SAID LEVER AND SAID PULL RODS, THE TRANSMISSION OF MOTION FROM SAID TIE TO SAID INNER PULL ROD BEING OSCILLATORY TO PROVIDE THE CLAMPING BOW WITH OSCILLATORY MOTION HAVING A REST PERIOD IN BOTH EXTREME POSITIONS; A CRANK INCLUDING A CRANK PIN CONNECTED THERETO AND TO SAID PRESSURE ROD TO DRIVE SAID PRESSURE ROD; AND MEANS FOR PIVOTALLY MOUNTING SAID PRESSURE ROD ON SAID SLIDE, THE PRESSURE ROD, CRANK AND TIE ROD BEING SO ARRANGED THAT THE PIVOT POINT OF THE PRESSURE ROD ON THE SLIDE, THE CRANK PIN AND THE PIVOT CONNECTION OF THE TIE ROD TO THE PRESSURE ROD ARE ALWAYS IN A SUBSTANTIALLY STRAIGHT LINE. 